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VitalesChopShop

need help converting from shaft to chain

12 posts in this topic

i got a set of wheels i want to use for my project, the wheels are off a 1982 seca j750. the rear is set up for shaft drive and I'm using chain drive (630). i am trying to find a rear sprocket that has this goofy ass bolt pattern (5 x 90mm) and am having no luck. i was going to make an adapter from a chunk of loonynum that i have but that is hours, possibly days of work. does anyone have a solution? aside from changing the bolt pattern the driven sprocket needs to move out from the wheel about 2 inches to catch the chain. i'm hoping someone already thought of this and did the leg work. thanks.

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Sprocket specialist will make custom sprockets.

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I explored those two options and am waiting for a quote. Is there like a master list somewhere of specific bikes that has their rear sprocket diameter and bolt spacing? I'm trying to use as many off the shelf parts as I can to keep the bike serviceable for cheap

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Just heard from sprocket specialist. Fuck no, that's not going to happen. 115 bucks and the bolt pattern is a crap shoot

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5x90 bolt pattern JTR604 for a Honda NSR125 RK. This is a steel sprocket you can search for LOONYNUM and self cleaning sprockets also.

http://www.jtsprockets.com/catalogue/model/175

What I did was go to JT sprockets website.

http://www.jtsprockets.com/

Click on catalog and then do a search.

Put a manufacture in. Then do a search thru all the sprockets for every bike that manufacture made like Honda.

I got maybe 10 minutes in this clicking thru different models and looking at the sprocket prints before I found this sprocket.

You can do the same to find a sprocket you might like better.

jtr604.jpg

Edited by CustomizeIT

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Spent about 15 minutes doing the same and didn't get any better. My only problem is that my front sprocket is a 630 pitch. I know very little about chain and sprockets but I can't imagine you can mix and match. I was hoping to keep it to a 630 chain

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Are you sure it is not a 530 sprocket? 630 sprockets are only used on high end sport bikes with stupid power. Something over 1200cc race bikes.

A 520 and 530 chain have the same roller pitch of 5/8ths. Only the width of the sprocket is different with the 530 being wider. So a 530 chain can be run on a 520 sprocket. And also a 50 series standard chain can be run on both sprockets being 5/8ths pitch also.

The 630 chain has a 3/4 in pitch with heavier link pins. That is why they are used on big cc sportbikes.

You may want to see if you can find a 530 drive sprocket and change it over to make this easy if it is 630? And then run a 530 chain.

http://www.yaban.com/upload/en/85/14_file_1.pdf

http://chain-guide.com/applications/1-5-2-motorcycle-chain.html

http://www.3guyz.com/index.php?option=com_content&view=article&id=76:530630chain&catid=7:examples&Itemid=94

I can find a 82 550 530 seca drive sprocket?

http://www.motorcycle-superstore.com/7789/i/jt-530-front-countershaft-sprocket

Do not know if it is the same because can not find info on the 750 bike to check sprocket sizing. But a 750 should not have a 630 chain sprocket?

Here is pricing on the rear sprocket of the Honda 125.

http://www.wemoto.com/bikes/honda/nsr_125_rk/89/picture/sprocket_rear_-_jt/

Edited by CustomizeIT

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The engine is a 1978 Suzuki gs1000. The oe spec gears are 630 so I stuck with that. I ordered a stock sprocket and am going to make a hub adapter

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I generally start out with an industrial sprocket blank and machine what I need.

http://www.surpluscenter.com/Power-Transmission/Sprockets/Weld-On-Sprockets/?page_no=9

http://www.youngssurplus.com/sprockets.htm

If you know the tooth count and pitch Google is your friend! the rear sprocket on Nakaiya cost $18.00 course I got a few hours machining n welding.

Dusty

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Most of the Suzuki guys swap the 630 stuff out for 530. Less expensive to begin with, and the newer 530 chains have as much strength as the older 630 anyway.

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Yeah I realized I should have done that after I bought the sprockets. They even had conversation kit that I didn't go for

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